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A Small Road to Misery in Necrotizing External Otitis

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A Small Road to Misery in Necrotizing External Otitis Published August 8, 2019 as 10.3174/ajnr.A6161 ORIGINAL RESEARCH HEAD & NECK A Persistent Foramen of Huschke: A Small Road to Misery in Necrotizing External Otitis X W.L. van der Meer, X M. van Tilburg, X C. Mitea, and X A.A. Postma ABSTRACT BACKGROUND AND PURPOSE: Necrotizing external otitis is a serious complication of external otitis with different spreading patterns. A persistent foramen of Huschke is a dehiscence located antero-inferior in the osseous external ear canal and posterior-medial to the temporomandibular joint. This dehiscence can facilitate extension of infection in an anterior pattern next to classic spread along the fissures of Santorini. The aim of this study was to define the prevalence and size of a persistent foramen of Huschke in patients with necrotizing external otitis. MATERIALS AND METHODS: We retrospectively examined 78 CT temporal bone studies (39 patients with necrotizing external otitis, 39 control subjects). The side and presence of the foramen were noted, and its prevalence was calculated. The maximal width of the foramen of Huschke was measured in the axial plane and classified as subtle, mild, moderate, or extensive. RESULTS: A persistent foramen of Huschke was present in 21 patients (26 ears) and 7 control subjects (9 ears). Prevalence was 50% (20/40) and 11.5% (9/78) in affected ears of patients with necrotizing external otitis and control subjects, respectively. Almost all affected ears showed an anterior distribution pattern of necrotizing external otitis. The extensive dehiscence was most common in affected ears. CONCLUSIONS: An anterior necrotizing external otitis spreading pattern is associated with the presence and increased size of a persis- tent foramen of Huschke. These findings facilitate the theory that a persistent foramen of Huschke is an additional risk factor the development of necrotizing external otitis. ABBREVIATIONS: EAC ϭ external auditory canal; NEO ϭ necrotizing external otitis; TMJ ϭ temporomandibular joint ecrotizing external otitis (NEO) is a rare-but-serious com- NEO can be categorized according to an anterior, posterior, Nplication when a persistent external otitis, most commonly medial, or an intracranial spreading pattern or a combination of caused by the bacteria Pseudomonas aeruginosa1, fails to resolve. these aforementioned categories.4,5 The classification depends on The infection can spread via fascial planes to surrounding soft the affected soft-tissue compartments and bone structures.5 In an tissues and bone structures. In severe cases, the infection affects anterior spreading pattern, the temporomandibular joint (TMJ), intracranial structures and cranial nerves with persistent impair- masticator space, parotid gland, or surrounding fat planes are 2 ment after treatment. Patients at risk for NEO most often are involved (Figs 1 and 2). The posterior spreading pattern affects elderly with diabetes and or are immunocompromised, and NEO the mastoid process, and the medial spreading pattern affects the 3 can have a mortality rate up to 15%. Hence, early recognition sphenoid, clivus, nasopharyngeal or pharyngeal muscles/fat, and and tailored treatment with intravenous antibiotics could have a cranial nerves IX, X, and XI. The intracranial pattern shows in- substantial impact on morbidity and mortality. volvement of the jugular fossa, jugular vein, sigmoid sinus, and dura. The spread of NEO from the external ear canal to its sur- Received February 20, 2019; accepted after revision June 30. From the Departments of Radiology and Nuclear Medicine (W.L.v.d.M., C.M., rounding structures is thought to occur via the fissures of A.A.P.) and Otorhinolaryngology and Head and Neck Surgery (M.v.T.), Maastricht Santorini, also known as the incisurae cartilaginis meatus acustici, University Medical Center, Maastricht, the Netherlands; and School for Mental Health and Neuroscience (A.A.P.), Maastricht University, Maastricht, the by extending through these osteocartilaginous or cartilaginous Netherlands. junctions of the external ear canal, spreading through fascial Please address correspondence to W.L. van der Meer, MD, Department of Radiol- planes and blood vessels to surrounding compartments (Fig 3). ogy and Nuclear Medicine, Maastricht University Medical Center, P. Debyelaan 25, 6229 HX Maastricht, the Netherlands; e-mail: [email protected] Thus, early changes in NEO can be subtle and therefore easily http://dx.doi.org/10.3174/ajnr.A6161 overlooked. One of the early subtle findings is infiltration of the AJNR Am J Neuroradiol ●:●●2019 www.ajnr.org 1 Copyright 2019 by American Society of Neuroradiology. FIG 2. A 76-year-old man without a medical history presented with a painful ear and otorrhea. CT shows an increased distance of the TMJ (A, white arrow), obliteration of subtemporal fat lines, and a retro- condylar fat pad sign (B. arrowhead), as well as osseous destruction of the mastoid (C, white curved arrow). Contrast-enhanced T1-weighted image 2 weeks after diagnosis demonstrates progression of NEO with FIG 1. A 79-year-old man with type II diabetes presented with a pain- an anterior, medial, and intracranial spreading pattern complicated by ful right ear and pain during mastication. CT shows an increased dis- a thrombus in the left jugular vein (D, black arrow) with increased FDG tance of the TMJ (A, white arrow) and infiltration of the retrocondylar accumulation on PET/MR imaging (E, asterisk). History revealed non- fat pad and surrounding fat planes (B, curved arrow). The contrast- compliance with antibiotic treatment. Biopsy of the external ear ca- enhanced T1-weighted MR imaging shows enhancement of the retro- nal was positive for P Aeruginosa. condylar fat pad (C, broad arrow), with increased FDG accumulation on PET/MR imaging (D, arrowhead). The biopsy of the external ear canal was positive for P Aeruginosa. retrocondylar fat pad, which is part of the NEO anterior spreading pattern.6 Some patients with NEO have a variant anatomic struc- ture called a persistent foramen of Huschke (foramen tympani- cum), a dehiscence located antero-inferior to the osseous external auditory canal (EAC) and posterior-medial to the temporoman- dibular joint (Fig 3). The foramen of Huschke has been described in relation to EAC salivary fistulas, TMJ herniation, the facilita- tion of tumor spread, and drainage of odontogenic abscesses in the EAC.7-10 The infectious spread from the TMJ to the EAC via the fora- men of Huschke may also occur the other way around. A persis- tent foramen of Huschke can also pose an alternative route for NEO, which will put the TMJ, masticator space, and parotid gland at risk. Identifying this anatomic variation in patients with NEO may help recognize NEO and its extension in early stages of dis- ease, thus preventing consecutive spread to its surrounding tis- sues, aiding a positive outcome in morbidity and mortality. The FIG 3. Coronal illustration of the location of the fissures of Santorini and the foramen of Huschke. The fissures of Santorini extend through goal of this study was to assess the prevalence and size of a persis- the osteocartilaginous or cartilaginous junctions of the EAC (arrows). The tent foramen of Huschke in patients with NEO and thereby de- foramen of Huschke (arrowhead) is located anterior-inferior to the EAC termine its value for routine assessment. and posterior-medial to the temporomandibular joint. MATERIALS AND METHODS tively included. All cases of NEO were confirmed by the Ear, Nose, A PACS survey was conducted with the key words “skull base and Throat Department in combination with EAC biopsy results osteomyelitis,” “necrotizing external otitis,” and “malignant ex- positive for microbiological organisms associated with NEO. ternal otitis.” In total, 39 patients diagnosed with NEO on tempo- Most patients underwent MR imaging, which confirmed the di- ral bone high-resolution CT scans in 2005–2018 were retrospec- agnosis of NEO. Scans were assessed for the type of spreading 2 van der Meer ● 2019 www.ajnr.org FIG 4. Temporal bone axial and sagittal views of patients with NEO with a persistent foramen of Huschke. The views show a subtle (1A and 1B), mild (2A and 2B), moderate (3A and 3B), and extensive dehiscence (4A and 4B) as indicated by the white arrows. Table 1: Demographics for patients with NEO and controlsa Table 2: Prevalence of the foramen of Huschke in patients with Controls NEO and controls NEO (n = 39) (n = 39) NEO Controls (n = 39) (n = 39) Age range Women Men Women Men Foramen of (Mean) (yr) (n = 11) (n = 28) (n = 11) (n = 28) Huschke No. Percentage No. Percentage P < .05 a 50–59 1 (51) 2 (50) 1 (59) 2 (56) Absent 18 46% 32 82% .002 a 60–69 2 (63) 9 (66) 2 (63) 9 (65) Present 21 54% 7 18% .002 70–79 3 (78) 6 (78) 3 (74) 6 (74) Unilateral 16 41% 5 13% – 80 or older 5 (87) 11 (86) 5 (84) 11 (84) Bilateral 5 13% 2 5% – Total 39 100% 39 100% a Data are number of patients per age range. Note:— – indicates data is not available. a Significant. pattern and the existence of a persistent foramen of Huschke on the first available CT of the temporal bone during the disease Table 3: Location of the foramen of Huschke in patients with NEO and controls process. CT scans of the temporal bone in the control group with Foramen of Huschke non-NEO or noninflammatory pathology (eg, hearing loss) were Present Absent matched for age and sex. Control scans with former destruction of the skull (eg, severe cholesteatoma, radiation therapy, or severe Location No. Percentage No. Percentage otitis media) were excluded. NEO spreading patterns and the NEO Left ear 16 41% 23 59% presence and/or absence of a foramen of Huschke were scored. Right ear 10 26% 29 74% The size of the persistent foramen of Huschke was measured as the Controls maximum width in the axial plane and classified as subtle (Ͻ0.5 Left ear 3 8% 36 92% mm), mild (0.5–1.0 mm), moderate (1.0–1.5 mm), or extensive Right ear 6 15% 33 85% (Ͼ1.5 mm) dehiscence (Fig 4).
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